This banana shaped ammunition can be loaded into any weapon that requires ammunition, including siege weapons, gaining the attributes of a mundane piece of ammunition for that weapon.
If you hit a creature with this weapon, a banana peel appears under their foot and they must make a DC 20 dexterity saving throw, falling prone on a failure. If they roll a 1 on the saving throw, regardless of if they would normally make it, they take an extra 10d6 bludgeoning damage as they land on their neck. If they succeed, the banana peel remains in their place, granting them disadvantage on any dexterity saving throws or attack rolls. If they would move out of the space of the banana peel, they must make the dexterity saving throw. The disadvantage imposed by the banana peel does not apply to this saving throw.
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